igorw/compose
Function composition.
Allows you to stitch functions together to form a pipeline. This can be useful if you have to transform data in many steps and you want to describe those steps on a high level.
compose
Generally, function composition means taking two functions f and g, and producing a new function z, which applies f to the result of g.
z = compose(f, g)
; z(x) => f(g(x))
This library provides a compose function that does just this.
$z = igorw\compose($f, $g);
var_dump($z($x));
It supports an arbitrary number of functions to be composed via varargs.
$z = igorw\compose($f, $g, $h, $i);
The innermost function (the last one in the list) can take an arbitrary number of arguments, whereas the others may only take a single argument.
$z = igorw\compose($f, $g);
$z('a', 'b', 'c');
// => $f($g('a', 'b', 'c'))
pipeline
pipeline is the same as compose, but the arguments are reversed. This is more easy to read in some cases, because you can list the functions in the order they will be called.
It is quite similar to a unix pipe in that regard.
Examples
function transform_data($data) {
return [
'name' => $data['firstname'].' '.$data['lastname'],
];
}
$transformJson = igorw\pipeline(
function ($json) { return json_decode($json, true); },
'transform_data',
'json_encode'
);
$json = <<<EOF
{"firstname": "Igor", "lastname": "Wiedler"}
{"firstname": "Beau", "lastname": "Simensen"}
EOF;
$list = explode("\n", $json);
$newList = array_map($transformJson, $list);
$newJson = implode("\n", $newList);
// =>
// {"name": "Igor Wiedler"}
// {"name": "Beau Simensen"}
4 Jan 9, 2022
11 Sep 9, 2022
5 Dec 14, 2022
6.4k Dec 29, 2022
22 Sep 7, 2022
17 Dec 30, 2022
41 Dec 19, 2022
10 Jun 29, 2022
5 Jan 11, 2022
1 Jan 22, 2022
1.1k Jan 6, 2023
1 Feb 5, 2022
212 Oct 24, 2022
1.6k Dec 22, 2022
10 Nov 1, 2022
13 Dec 26, 2022
82 Jan 16, 2022
21 Aug 17, 2022
2 Apr 1, 2022
4 Dec 27, 2022
7.1k Dec 23, 2022
142 Dec 25, 2022
39 Nov 22, 2022
304 Jan 6, 2023
22 Nov 24, 2022